Author Topic: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3  (Read 601160 times)

Offline John Alan

  • Full Member
  • ****
  • Posts: 525
  • Central IL - USA - Earth
  • Liked: 261
  • Likes Given: 1283
Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #960 on: 05/25/2016 01:49 PM »
I understand wind is a concern for landing -- what about rain or dropping through a thunderhead?

Could this be an ASDS Rainout?

Rain... Wind... Upper level winds overhead...
My guess is they go for it no matter what... and get whatever data it provides...

Landing in a rain squall would make for some interesting onboard (and onboat) video...  :o  ;D
If you ever landed a plane (or sim) on instruments... you would get my meaning...
Flying blind right down to the numbers is always "interesting"...  :P
« Last Edit: 05/25/2016 01:57 PM by John Alan »

Offline guckyfan

  • Senior Member
  • *****
  • Posts: 6441
  • Germany
  • Liked: 1620
  • Likes Given: 1484
Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #961 on: 05/25/2016 01:53 PM »
We haven't seen onboard video for a while. Or did I miss it?

Offline John Alan

  • Full Member
  • ****
  • Posts: 525
  • Central IL - USA - Earth
  • Liked: 261
  • Likes Given: 1283
Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #962 on: 05/25/2016 02:01 PM »
We haven't seen onboard video for a while. Or did I miss it?
My guess is the last one (flown at night) was not very interesting to see...
That is assuming it worked ok after that reentry... (lens not smoked over, etc)
One before that there was something wrong with the lens... (crack or something)
But no... no video IIRC on last one was released to public... :(

Offline Wolfram66

http://www.spc.noaa.gov/exper/mesoanalysis/new/archiveviewer.php?sector=18&parm=shr8#

 ;D 8) here's a nice dynamic graphic of rain potential in FL & Bahamas

Offline CJ

  • Full Member
  • ****
  • Posts: 801
  • Liked: 569
  • Likes Given: 179
Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #964 on: 05/27/2016 01:10 AM »
I'm getting a bit nervous about the potential for tropical storm development.

http://www.accuweather.com/en/weather-news/will-bonnie-form-in-the-atlantic-and-impact-eastern-us-coast-during-memorial-day-weekend-rough-seas-rip-currents-heavy-rain/57683397

The graphic shows a rather large red area over OCISLY.


Offline southshore26

I'm getting a bit nervous about the potential for tropical storm development.

http://www.accuweather.com/en/weather-news/will-bonnie-form-in-the-atlantic-and-impact-eastern-us-coast-during-memorial-day-weekend-rough-seas-rip-currents-heavy-rain/57683397

The graphic shows a rather large red area over OCISLY.

Don't be... it's early in the season and the weather nuts (I'm one of them) are just looking for some clouds going in circles to slap a name on it. Tropical depressions are just a bunch of rain... not a ton of wind... doesn't even whip up the seas that much either. Shouldn't be an issue.

Offline Wolfram66


Offline Ohsin

  • Full Member
  • ****
  • Posts: 1469
  • Liked: 1449
  • Likes Given: 2381
Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #967 on: 05/27/2016 11:04 PM »
https://twitter.com/elonmusk/status/736320322996076548
This wobbly one will sure test the crew. This is why jacks are important!
"Well, three cheers to Sharma, but our real baby is INSAT."

Online Herb Schaltegger

https://twitter.com/elonmusk/status/736320322996076548
This wobbly one will sure test the crew. This is why jacks are important!

Indeed. I don't envy the recovery crews.
Ad astra per aspirin ...

Offline John Alan

  • Full Member
  • ****
  • Posts: 525
  • Central IL - USA - Earth
  • Liked: 261
  • Likes Given: 1283
Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #969 on: 05/27/2016 11:58 PM »
Is that a person I see on board OCISLY during landing...  :o

Back right corner... I circled the area in red...
Go play it back at You Tube... 38:07 on or so...

Blow it up full screen and watch closely behind that yellow rail as it runs...
Maybe it's a camera on rails or something... it's moving back and forth quite a distance...  ???

« Last Edit: 05/28/2016 12:11 AM by John Alan »

Offline launchwatcher

  • Full Member
  • ***
  • Posts: 315
  • Liked: 216
  • Likes Given: 245
Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #970 on: 05/28/2016 01:09 AM »
Is that a person I see on board OCISLY during landing...  :o

Back right corner... I circled the area in red...
Go play it back at You Tube... 38:07 on or so...

Blow it up full screen and watch closely behind that yellow rail as it runs...
Maybe it's a camera on rails or something... it's moving back and forth quite a distance...  ???
Looks to me like a tethered helium-filled mylar party balloon

Offline CJ

  • Full Member
  • ****
  • Posts: 801
  • Liked: 569
  • Likes Given: 179
Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #971 on: 05/28/2016 01:16 AM »
Is that a person I see on board OCISLY during landing...  :o

Back right corner... I circled the area in red...
Go play it back at You Tube... 38:07 on or so...

Blow it up full screen and watch closely behind that yellow rail as it runs...
Maybe it's a camera on rails or something... it's moving back and forth quite a distance...  ???

If you look at the vid after touchdown, you see a ring hanging just to the right of where that was. It's not there pre-landing, while your moving object is visible. I'm not positive, but I think it's more likely than not a lifering batting around in the wind, and the F9 landing pushed it to the other side of the rail.

I also note that the deck was wet this time, but hasn't been for some landings. Anyone have any ideas why they might wet the deck some times but not others?

Offline Lar

  • Fan boy at large
  • Global Moderator
  • Senior Member
  • *****
  • Posts: 9068
  • Saw Gemini live on TV
  • A large LEGO storage facility ... in Michigan
  • Liked: 5751
  • Likes Given: 3839
Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #972 on: 05/28/2016 01:24 AM »
I also note that the deck was wet this time, but hasn't been for some landings. Anyone have any ideas why they might wet the deck some times but not others?

Ask Thor. I think it might be rain....
"I think it would be great to be born on Earth and to die on Mars. Just hopefully not at the point of impact." -Elon Musk
"We're a little bit like the dog who caught the bus" - Musk after CRS-8 S1 successfully landed on ASDS OCISLY

Offline brettreds2k

  • Full Member
  • ****
  • Posts: 714
  • Charlotte, NC
  • Liked: 11
  • Likes Given: 25
Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #973 on: 05/28/2016 02:40 AM »
Is that a person I see on board OCISLY during landing...  :o

Back right corner... I circled the area in red...
Go play it back at You Tube... 38:07 on or so...

Blow it up full screen and watch closely behind that yellow rail as it runs...
Maybe it's a camera on rails or something... it's moving back and forth quite a distance...  ???


I also note that the deck was wet this time, but hasn't been for some landings. Anyone have any ideas why they might wet the deck some times but not others?

Maybe they wet the deck for sound suppression this time or maybe to help absorb flame blowback to keep the underside from catching fire like the last 2 returns??
Brett
www.facebook.com/brett.lowenthal1

Orbiters I have visited in retirement:

[ ] Enterprise
[X] Discovery
[X] Atlantis
[ ] Endeavour

Offline CJ

  • Full Member
  • ****
  • Posts: 801
  • Liked: 569
  • Likes Given: 179
Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #974 on: 05/28/2016 04:01 AM »
At the moment, we appear to have an F9 of questionable stability on the ASDS. (per concerns from SpaceX that it might tip over).

So, what now? They have to put a crew aboard at some point (they need to attach the tow line if nothing else). I'm assuming they'll vent the LOX first.

I'm wondering if they have options (now or in the future) to deal with this kind of situation without putting crew aboard? Assuming the problem is one of the legs is not making full contact and thus the stage wobbles a bit, could the cherry picker be remotely controlled to place jacks, shims, etc, under the F9?


Online docmordrid

  • Senior Member
  • *****
  • Posts: 4383
  • Michigan
  • Liked: 1504
  • Likes Given: 1
Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #975 on: 05/28/2016 05:56 AM »
Or simply put a glorified doorstop under the short leg. Kiss.
DM

Offline EngrDavid

  • Member
  • Posts: 9
  • Liked: 2
  • Likes Given: 0
Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #976 on: 05/28/2016 06:28 AM »
Maybe drive the cherry picker over to the opposite leg to the one that is slightly crushed and use it to press down on that leg with its lift basket. Once this is done, the rocket should be resting on the 3 good legs. Then get the jacks under the rocket and jack it off the legs.

Offline rickl

  • Full Member
  • ****
  • Posts: 854
  • Pennsylvania, USA
  • Liked: 100
  • Likes Given: 125
Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #977 on: 05/28/2016 08:06 AM »

So, what now? They have to put a crew aboard at some point (they need to attach the tow line if nothing else). I'm assuming they'll vent the LOX first.


I assume the LOX would be vented immediately after landing, wouldn't it?  Just open the valve.
Nominal now means "Yeehah!!"

Offline the_other_Doug

  • Senior Member
  • *****
  • Posts: 2594
  • Minneapolis, MN
  • Liked: 1617
  • Likes Given: 2910
Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #978 on: 05/28/2016 06:18 PM »
By the way -- the onboard rocket cam view of the approach and landing clearly shows that OCISLY's deck had been freshly repainted prior to going out for this mission.  I'm not positive, but I don't think it had been repainted between CRS-8 and JCSAT.

So, of the three successful ASDS landings, all three on OCISLY, it appears they repainted the deck at least once, and perhaps twice (I can't be certain if JCSAT's core was recovered with a blast-dirtied deck).

Of course, after the first hot entry landing attempt ended in a hole in the deck, maybe SpaceX thought they would skip the paint job prior to the second hot entry attempt, since there was still a significant possibility that a hot entry would not only result in a repaint needed, but more deck plating replaced...  ???
-Doug  (With my shield, not yet upon it)

Offline woods170

  • IRAS fan
  • Senior Member
  • *****
  • Posts: 7480
  • IRAS fan
  • The Netherlands
  • Liked: 3266
  • Likes Given: 950
Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #979 on: 05/28/2016 09:22 PM »
By the way -- the onboard rocket cam view of the approach and landing clearly shows that OCISLY's deck had been freshly repainted prior to going out for this mission.  I'm not positive, but I don't think it had been repainted between CRS-8 and JCSAT.

So, of the three successful ASDS landings, all three on OCISLY, it appears they repainted the deck at least once, and perhaps twice (I can't be certain if JCSAT's core was recovered with a blast-dirtied deck).

Of course, after the first hot entry landing attempt ended in a hole in the deck, maybe SpaceX thought they would skip the paint job prior to the second hot entry attempt, since there was still a significant possibility that a hot entry would not only result in a repaint needed, but more deck plating replaced...  ???
Paint(ing) is cheap.

Tags: